Thomas Carr

2. a strike-slip fault that offsets a mid-ocean ridge in opposing directions on either side of an axis of seafloor spreading
3. sliding plate force
4. a block of the earth's surface between nearly parallel faults or fault systems.
5. the gradual movement of the continents across the earth's surface through geological time.
6. oceanic crust is formed through volcanic activity and then gradually moves away from the ridge
7. two plates move towards each other
9. two plates move away from each other
10. the hypothetical landmass that existed when all continents were joined, from about 300 to 200 million years ago.
11. a line on a diagram or map connecting points relating to the same time or equal times.
12. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate
13. is the portion of motion of a tectonic plate that can be accounted for by its subduction. Plate motion is partly driven by the weight of cold, dense plates sinking into the mantle at trenches.

1. measures change in magnetic fields
2. in geology: the lithosphere of the earth is divided into a small number of plates which float on and travel independently over the mantle and much of the earth's seismic activity occurs at the boundaries of these plates.
8. magnetic field points opposite then normal